,4-Dichloro-1,2,5-thiadiazole
3,4-Dichloro-1,2,5-thiadiazole
CAS: 5728-20-1
Molecular Formula: C2Cl2N2S
,4-Dichloro-1,2,5-thiadiazole - Names and Identifiers
| Name | 3,4-Dichloro-1,2,5-thiadiazole |
| Synonyms | DCTD 4ETHYL4AMINOBIPHENYL 3,4-Dichlor-1,2,5-thiadiazol ,4-Dichloro-1,2,5-thiadiazole 3,4-Dichloro-1,2,5-Triadiazole 3,4-DICHLORO-1,2,5-THIADIAZOLE 4,5-Dichloro-2,1,3-thiadiazole 3,4-Dichloro-1,2,5-thiadiazole |
| CAS | 5728-20-1 |
| EINECS | 227-232-7 |
| InChI | InChI=1/C2Cl2N2S/c3-1-2(4)6-7-5-1 |
,4-Dichloro-1,2,5-thiadiazole - Physico-chemical Properties
| Molecular Formula | C2Cl2N2S |
| Molar Mass | 155.01 |
| Density | 1.648 g/mL at 25 °C (lit.) |
| Melting Point | 82-83 °C |
| Boling Point | 158 °C (lit.) |
| Flash Point | >100°C |
| Solubility | Soluble in chloroform and methanol. |
| Vapor Presure | 3.47mmHg at 25°C |
| Appearance | Oil |
| Color | Colorless |
| BRN | 606585 |
| pKa | -3.82±0.10(Predicted) |
| Storage Condition | Keep in dark place,Sealed in dry,Room Temperature |
| Sensitive | Hygroscopic |
| Refractive Index | 1.561 |
| Physical and Chemical Properties | Liquid, boiling point 158 ℃/101.32kPa,101-102 ℃/16.27kPa, relative density 1.648, refractive index 1.5610, moisture absorption. |
,4-Dichloro-1,2,5-thiadiazole - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S37/39 - Wear suitable gloves and eye/face protection |
| UN IDs | UN2810 |
| WGK Germany | 2 |
| HS Code | 29349990 |
| Hazard Class | 6.1 |
| Packing Group | III |
,4-Dichloro-1,2,5-thiadiazole - Reference Information
| introduction | 3, 4-dichloro-1, 2, 5-thiadiazole is an organic intermediate, which can be obtained by ring closure from dichloroethoxime as raw material. |
| Preparation | Under argon at -25°C, S2Cl2(0.64mL,8.00mmol) is added dropwise to dichloroglyoxime (2.0mmol) and pyridine (0.80mL,10.0mmol) in an agitated solution of anhydrous acetonitrile (10mL). Stir the mixture at ambient temperature for 1 hour. The mixture was refluxed for 4 hours and then filtered. The solvent was evaporated under reduced pressure. Use column chromatography (silica gel Merck 60, hexane/CH2Cl2 mixture) to separate the residue to obtain 3, 4-dichloro-1, 2, 5-thiadiazole. |
| Use | An intermediate of timolol. Used as thiolamine intermediate |
Last Update：2024-04-09 20:52:54
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